Lathe dog



Juney 30, 193%1. c. R. 'rAcscaAR'rl 1,812,180

LATHE DOG Filed oct. 7, 1929 ATTORNEY y 25 Figure a detail of theadjusting Set andoften loss Yof the work itself, in cutting PatentedJunegsaiesi' ,y y' 1581251801.' I i um STATES s "CHARLES it.'.raesrait'r; oFsAN ijitANcisoo, CALIFORNIA Y' f ,L

l LA'riinnod4 y i 'Y i Appncanon ined yoctober k7', 1929. yserenita.Stasia."

This invention relates particularly to lathe Lathe dogs vare usedinconjunction with* e dogs. face plates on lathe spindlesfy Alive centeris Among the objects of theinventionistoprofixed in thehead stock inalignment with a vide means for taking up the lost motion be-v similardead `center in the' tail stock.v The tween the lathe dog in itsengagement with work,.which may be ajsliaftrhas its oppo- 55 the faceplate, to prevent slippingand chatsite ends centeredto engage thesaidcenters. Y tering of the work being held leyv the'dog. The work passesthrough and `is clamped in Other ob'ects and advantages will appear Vasthe hole 2byl the set screw 4. f 'i the description progresses. The tail8 on tr e dog, extends through one Y 10 In this specification and theannexed drawof the plurality of radial slots formed 60 ings theinvention is disclosed in its preferred through the face plate. Theseplates are form. But it .isfto be understood that it is n usually castiron with the slots cored through" A not limited tofthisv form, becauseit may be the cross section of the plate, and are left embodied inotherforms. It is also to he"y unfinislied'or rough. It is thereforeimposunderstood that in and by the claims fol sible to littheconventionalVdog'snugly intol 65 lowing the description it is desiredto cover y onev ofthese Slots. l1f there is' any play or4 y*theinvention in whatsoever form it may be freedom between the dog and thefaceplate, l

embodied. the work will chatter orV back lash, making In the one sheetof drawings: e Y it'impossible to achieve accuracy in thread Figure 1isa front elevation of a lathe dog turning or tooling the work. 70constructed in accordance with this invention. It has been the practiceheretofore to; in-

Figure 2 is a side elevation of the same, troduce shimsandwedges'between the sides p partially broken away to disclose theconofthe tail and the sidesof the slot in the face struction of theadjusting means. plate, .with vindifferent results, loss of time screw.n threaded spindles and other accurate turnv Y* i In detail theconstruction illustrated in ing.v

' the dlLWngS COIHPSGS the mCllathe The present dog is applied inaccordance y dog, having the circular body portion l, With with theconventionalpractice,.except that Y thehole 2 therethrough to' receivethe work t0 .s the necessity for wedging is eliminated. The 80j i beheld. i l Vtail 8 is inserted in the slotin the face plate The lug 3 isthreaded to receive the set s and turned on its stud 1() untilbothedges'of screw 4, adapted to force the work into the the tail contactboth sides'of the slot in the V- V shaped 'jaw 5 to hold thesame againstrofV face plate, y Y y Y l K 1 tation in the dog, in the usual manner. sThus adjusted, the'set screwV 13 is setup The neck@ extendsoutward fromthe body tight until vthe shoulder i4 wedges against v 1, andterminatesin a-rounded hub 7, having the stud 10 and xes thetailfinitsadjusted L11 tXial hlG illlellethlougll. The torque, i'iliilposition in th@ Slot 0f th@ face' plate," y Y 8 is substantially oval incross section and The ladvantage of the groove andstem Y 40 has thecheek plate or flanged head 9 formed engagement 11, 12, is that theset,screw'13can=90 thereon adapted to set flush with the faced be backedout y'of-:theset position, for the side of the hub7 swiveling ofthetail. without .releasing the j Y c i' The stud v10 is preferablyformedintegrally stud 10 from the head 11. v f

i with the tail 8. It fits snugly within the hole Invery heavy dogsY itmay be desirable to fp.

v through the headv 7,'. It has the annular provide a taper study andhead engagement 9e groove 11 therein to engage the stem 12 of the 10, 7,with a jam nut threaded on the stud 1 transverse set screw 13,transversely threaded 4to bear againstthe outer face of the head 7 inthe head 7. l The vtapfer shoulder 14 is Another optional modificationissuggested' adapted to jam in thegroove 11 to lock the tail in dottedlines in Figure 1, comprising a slot 5C; 8 in the desired adjustedposition. y 15, leading from the hole in the head 7, downl VW 1f 'i intothe neck 6. The transverse screw 16 threaded in the neck Would pinch thestud 10 in the head 7.

The invention has been described in its application to lathe Work. It isequally applicable to use in gear cutting mills, wherein it is essentialthat the gear blank be held in its original adjusted position to insureprecision in the finished gear. Its application to other uses will bemanifest to those skilled in the art..

Having thus described this invention What is claimed and desired tosecure by Letters Patent is:

l. A lathe dog having a tail sWiveled in its head and means for settingsaid tail in adjusted angular positions.

2. A lathe dog having a head With a hole therethrough, a tail having astud rotatably engaging said hole, and means for locking said tail inadjusted angular positions.

In testimony whereof I have hereunto `set my hand this 26th day ofSeptember, A. D.

CHARLES R. TAGGART.

